It's theoretically possible but practically impossible. The Serbian/Bosnian truce ends in 1450 I think so you'd have to convert in less than 10 years, which is 99.9999% unlikely. Afterwards the emperor has to die the moment you convert along with already having the necessary votes. I remembering adding something like a small chunk of England, chunk of Hungary, chunk of Muscovy and Lithuania and only barely getting up to Reform the Hofgericht. Only after take nearly all of Eastern Europe and passing Enact Gemeiner Pfennig with natural IA tick did I have enough land to revoke. Remember Anatolia is all Sunni and conversion rate is weak early even with Religious.
The tag switch also requires another conversion which can only be done after Proclaim Erbkaisertum. For this reason it's essentially useless as you mind as well just abdicate and make the new emperor/Austria into a vassal.
I looked a really really long time for the fastest way to revoke on this patch, and from what I could gather Kazan and Uzbek are the only options that also rely on the least RNG. Ruler death chance is near impossible to scum for due to how low it is. Counting on Friedrich dying at age 61 is the safest bet to get elected the first time without forcing re-election through war.
Don't have to convert land when you have none
I know, I know, I'm losing stylepoints here. It was really one of my very first runs and I thought I was being smart by releasing a vassal so I could flip to christian faster.
Didn't even use Dhimmis.
Second attempt I got it in 1462 without releasing a vassal and was fully converted.
Used Georgia as my war to delay breaking to rebels (Christian, Europe).
40+ IA after being elected, sometimes the first reform already got passed and ~60 provinces ready to add. That's without getting BI.
Second reform in 1462 with a bit in the bank for number 3.
With the exploit it's all four in 1462 if you get more than just double and "only" three reforms if you get the minimum.
The rest is trivial. 2 or 3 reforms in 40 years with that amount of cheap dirt in your north and everything already being Christian isn't difficult to pull off.
But I get your point.
A "fastest way" that's based on RNG isn't the fastest way. No strategy guide will ever recommend "Start the game and hope for PUs in the first year if you want to get kinslayer" or similar.
Revoking in 1500 using the current exploit only requires basics if you're lucky enough with timely deaths.
Kazan remains the better choice though.
Because luck is not a strategy.
